coast, dangerous outdoor conditions, the heat index pushing well into triple digits. this little girl trying to cool down in washington d.c. where it felt like 106 degrees today. and the hot, dry conditions fueling wildfires. more than 20 large fires burning across the west, including the sand fire near los angeles, growing four times overnight. the forecast in a moment, but first abc's eva pilgrim on this dangerous heat wave. >> reporter: tonight, 100 million americans from california to new york caught in a dangers he wave. >> heat exhaustion, heat stroke, patient is intubated. temperature 102. >> reporter: in phoenix, arizona, a 12-year-old rushed to the hospital, died after a day hiking. at least eight people across the country in the last week have died due to the heat includidina 70-year-old memphis pastor who didn't have ac in his home. >> we think he was overtaken by the heat. >> reporter: in the nation's capital, emergency crews say they are getting three times more calls for heat issues.